非直角双曲线光合模型的积分及参数灵敏度分析          下载免费PDF全文

吴元中  段项锁 《应用气象学报》1993,4(4):504-508

非直角双曲线单叶光合模型对光合反应有更灵敏的响应。将它对叶面积积分，并用于大田干物质计算。其精度比用直角双曲线型的叶面积积分模式有所提高。对光合参数作了灵敏度试验，并指出育种和数值模拟试验中应注意的问题。  相似文献   

考虑吸收时确定震源深度的宏观地震方法     

段星北 《东北地震研究》1993,(2)

基于对在近场吸收系数A/km~2和源指标几何扩散率n都因实际地震而异的认识,导出了完整宏观地震震源深度公式,获得确定震源深度考虑吸收的宏观地震方法的通解。对此通解及宏观地震震源深度公式各提出三种算法以满足三种需要,经过三个实例,两公式六种算法对比计算结果都很好,并利用所得震源类型结合宏观场探索了震源几何学,为钻探地震直接观察震源的钻孔设计提供依据。  相似文献   

上海及其邻区楔形断裂系统北翼断裂构造岩显微构造及岩组动力学研究     

王允侠  高灯亮 《上海国土资源》1993,(4):46-51

本文通过对断裂构造岩显微构造特征的研究,进而对石英变形纹及光轴系统测量统计,进行岩组动力学分析,重建了断裂活动时的应力场特征及演化。并对断裂空间分布,断裂性质,运动方式、方向,生成环境及活动时期等作出推论。从而验证和进一步揭示了断裂的宏观构造特征。  相似文献   

Some characteristics of cumulus convection over the Tibetan Plateau     

Duan Tingyang  Elmar R. Reiter 《大气科学进展》1990,7(1):87-97

The diagnostic model of the cumulus convection proposed by Yanai et al. (1973) was applied to the atmosphere over the Tibetan Plateau, and used to estimate the vertical mass flux, entrainment and detrainment, excess temperature and moisture, liquid water content, and condensation and precipitation rates of highland cloud clusters. The re-sults illustrated that in clouds over the Tibetan Plateau, the water vapor condensation rate, liquid water content, and efficiency of the rain generation process are less than those in the tropics (represented by the Marshall Islands region). Therefore, the condensational latent heat released over the Tibetan Plateau, overall, is much smaller than that in the tropics. The water vapor and liquid water detrainment from shallow nonprecipitating cumulus clouds, and their entrainment into deep cumulus clouds, serve as a growing mechanism for the deep precipitating cumulus towers over the Tibetan Plateau. It should be noted that there is a stronger detrainment of liquid water from cumulus clouds and a stronger re-evaporation rate in environment. The process of the condensation-detrainment-re-evaporation-entrainment is repeatedly in progress. It would play an important role in maintaining of cumulus convection on the condition that the supply of moisture is not plentiful over the Tibetan Plateau.The analyses also showed that the cloud mass flux Mc over the Tibetan Plateau is less, and the large-scale av-erage upward motion is much less than those over the Marshall Islands. Stronger compensating downward motion in the cloud environment over the Tibetan Plateau, responsible for the area’s strong environmental heating rate was re-vealed, and would link to the stability of the South Asian High in summer.  相似文献   

我国中新生代陆相盆地构造-砂体复合油气藏类型划分与分布特征          下载免费PDF全文

段俊琥 《沉积与特提斯地质》1990,10(4):26-34

为了促使油气普查勘探的深入发展,注入新的活力,作者从我国中新生代陆相盆地基本特征,以及油气普查勘探的实践出发,提出构造-砂体复合油气藏的新类型,以期达到抛砖引玉的作用,供同志们讨论。一、构造-砂体复合油气藏类型的提出和含义油气藏的分类是个十分复杂的问题,包括的范围比较广泛,这里所讨论的中新生代陆  相似文献   

A Lower Ordovician Carbonate Contourite Drift on the Margin of the South China Paleocontinent at Jiuxi,Northern Hunan     

Duan Taizhong  Guo Jianhua  Gao Zhenzhong  Li Zenghua  Zeng Yunfu 《《地质学报》英文版》1990,64(4):393-407

Carbonate contourite drift at Jiuxi. Taoyuan, northern Hunan, was developed in a deepwater area ofnorthern Hunan on the margin of the Early Ordovician South China palcocontinent. The Lower Ordoviciansequence in the area is more than 350 m thick and contains well-developed contourites that can be groupedinto the following five types: the calcilutitic, the arenitic, the siltitic. the fine ruditic and the bioclastic. Thefirst three often constitute a complete or incomplete contourite succession. The arenitic contourite is nearlyuniformly distributed as interlayers throughout the succession, creating a monotonously rhythmic texture inthe contourite drift. The pattern of spatial distribution of the succession shows that the contourite drift is ahuge ridge-like sedimentary body extending along the trend of paleoslope. Numerous marks of flow direc-tion have pointed to an eastward paleoflow direction along the slope.  相似文献   

掺杂作用与HW模型在掺杂作用研究中的应用   总被引：5，自引：0，他引：5  

袁见齐  段振豪 《地球科学》1989,14(5):553-562

  相似文献   

河北省怀安盆地北缘断裂活动性研究   总被引：2，自引：0，他引：2  

方仲景  段瑞涛 《华北地震科学》1994,12(4):25-33

本文以野外地质调查为主，讨论了怀安盆地北缘断裂的几何展布和活动特征，并进行了断裂的活动性分段，对断裂的运动学特片也进行了探讨，研究认为，该断裂是一条第四纪活动断裂，以东段活动性最强，Ｑ３＾２以来平均垂滑动速率达０．２１－０．２２ｍｍ／ａ；中段活动次之，西段活动较弱，整个断裂活动年代有自西南向东北迁移的趋势。最后，文章对１６２６年２５／４级地震的震中位置作了讨论。  相似文献   

Reply by authors to W. K. Tso     

X. N. Duan  A. M. Chandler 《地震工程与结构动力学》1994,23(6):691-694

  相似文献   

图象分析在岩石矿物研究中的应用     

陈基娘  李端 《现代地质》1994,8(1):79-87

本文论述图象分析在岩石矿物学中进行自动和半自动定量统计的简要原理、应用软件程序、操作要点、实例分析、应用范围和方法等。  相似文献